README.md

TestCase事件

TestCase事件是挂在每个test case执行前后的，我们需要写一个类，继承testing::Test，然后需要实现的是SetUp方法和TearDown方法(override虚函数)：

1. SetUp()方法在每个test case之前执行

2. TearDown()方法在每个test case之后执行

示例代码如下：

class MyStringTest : public testing::Test {
protected:
    virtual void SetUp()
    {
        std::cout << "MyStringTest SetUp, s_count: " << s_count << std::endl;
        std::cout << "MyStringTest SetUp, m_count: " << m_count << std::endl;
        s_count++;
        m_count++; 
    }
    virtual void TearDown()
    {
        std::cout << "MyStringTest TearDown, s_count: " << s_count << std::endl;
        std::cout << "MyStringTest TearDown, m_count: " << m_count << std::endl;
    }

    // Some expensive resource shared by all tests.
    static int s_count;
    int m_count = 0;
};

int MyStringTest::s_count = 0; 

const char kHelloString[] = "Hello, world!";  
  
// Tests the c'tor that accepts a C string.  
TEST_F(MyStringTest, ConstructorFromCString) {  
    std::cout << "TEST_F(MyStringTest, ConstructorFromCString), s_count: " << s_count << std::endl;
    std::cout << "TEST_F(MyStringTest, ConstructorFromCString), m_count: " << m_count << std::endl;
    s_count++;
    m_count++; 
    const MyString s(kHelloString);  
    EXPECT_EQ(0, strcmp(s.c_string(), kHelloString));  
    EXPECT_EQ(sizeof(kHelloString)/sizeof(kHelloString[0]) - 1,  
        s.Length());  
}  
  
// Tests the copy c'tor.  
TEST_F(MyStringTest, CopyConstructor) {  
    std::cout << "TEST_F(MyStringTest, CopyConstructor), s_count: " << s_count << std::endl;
    std::cout << "TEST_F(MyStringTest, CopyConstructor), m_count: " << m_count << std::endl;
    s_count++;
    m_count++; 
    const MyString s1(kHelloString);  
    const MyString s2 = s1;  
    EXPECT_EQ(0, strcmp(s2.c_string(), kHelloString));  
}